ISLAMABAD (Reuters) - Pakistans spy agency on Wednesday shrugged off testimony from an American who says he scouted targets for the 2008 Mumbai attacks by Pakistani militants with the help of at least one Pakistani intelligence official. David Headley, a Pakistani-American, pleaded guilty last year to being a co-conspirator in the Mumbai attacks, in which 10 militants from Lashkar-e-Taiba (LeT) killed 166 people, including six Americans. He is a prosecution witness at the Chicago trial of a businessman, Headleys childhood friend, accused of providing a front for Headleys surveillance work in India. Headley, 50, said he was introduced to a retired Pakistani military officer at a mosque, and reported regularly to his LeT handlers and an Inter-Services Intelligence (ISI) officer called Major Iqbal. These groups operated under the umbrella of ISI ... they coordinated with ISI, Headley said on Tuesday.I have nothing to say on this. This is his opinion, whatever hes saying, said a senior Pakistani intelligence official who requested anonymity. Major Iqbal, he said, The name itself means nothing. How many Iqbals are there in the Pakistan Army or ISI? And if he is what hes quoted to be, do you think he would have given his true name? Headley is testifying against Tahawwur Rana, 50, who is accused of using his immigration services firm to provide a cover story for Headleys surveillance work and to be a conduit for communication with militants. Headley told the court on Tuesday that the list of targets changed as the raids grew near. He testified that his handler with Pakistans Inter-Services Intelligence directorate, Major Iqbal, told him to check out all the targets carefully. He told me to do detailed surveillance and he seemed upset that (Mumbais) airport was not on the list, said Headley, an American who grew up in Pakistan.